These five events of mitosis are not in order…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
These five events of mitosis are not in order.
- The chromosomes lie on the metaphase plate.
- The nuclear envelope forms round each group of chromosomes.
- The chromatin condenses into chromosomes, each of two chromatids.
- The sister chromatids move to opposite poles.
- The nuclear envelope breaks into vesicles, and spindle fibres join the kinetochores.
- Write the events in the right order.
- Name the stage of each event, using the five stages taught by A-Level, IB and AP.
- Which stage of NCERT has no name of its own in these five?
Need a reminder? The key ideaShow
Mitosis runs in the order prophase, prometaphase, metaphase, anaphase and telophase. Each chromatid has its own kinetochore. At anaphase the centromeres split, and every chromatid is counted as a chromosome. The whole cell then holds twice the chromosome number of a G1 cell, but the same 4C of DNA.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The order is .
Step 2. (b) Event 3 is prophase. Event 5 is prometaphase. Event 1 is metaphase. Event 4 is anaphase. Event 2 is telophase.
Step 3. (c) Prometaphase. NCERT puts its events at the end of prophase and the start of metaphase.
Answer: 3, 5, 1, 4, 2; prophase, prometaphase, metaphase, anaphase, telophase; prometaphase.
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